Apparatus for removing dust



Feb. 19,1924; R. c. COLLINS APPARATUS FOR REMOVING DUST FJEled March 27, 1917 Patent Feb. 19, me.

Brennan-o. COLLINS, or ntrvinons'r, N

MENTS, TO SHOE MACHINERY CORPORATION OF NEW JERSEY,

EWHYORK, ASSIGNOR, BY Mme ASSIGN- ooaronarroiu, or rncrnnson, NEW JERSEY,

APPARATUS FOR REMOVING DUST;

Application flled'march 27, 1917. SerialNo. 157,853;

To all whom it may concern:

Be it known that I, RICHARD. C. COLLINS,-

a citizen of the 'United States, residing at Elmhurst, in the county of Queens and 6 State of New York, have invented certain Improvements in Apparatus for Removing Dust, of which the following. description, in connectionwith theaccompanying drawings, is a specification, like reference char- 1 actors on the drawings indicating like parts in the several figures.

This invention relates to abrading and similar machines and is herein illustrated in connection :with a machine for buffing 16 the soles of boots. and shoes.

In'machines of this type a large amount of dust is generated by the action of the tool upon the work, anddust hoods have been provided the function of which was so to carry away this dust. These hoods, however, have not. worked satisfactorily for two reasons. In the first place in their construction no account has been taken of the natural path or paths taken by the dust as. a'result' of the rotation of the buffing tool. In the second place now-attempt has been made to conserve the draft of the blower system with which the ordinary shoe factory is furnishe so a rotating buffing roll is located, in the mouth of an ordinary hood and a shoe .is applied to the lower front portion of the roll, the bulk of the dust generated tends to be thrown off in an obliquely upward and backwarddirection while most of the,

remainder is carried around the roll after the manner of an atmosphere until it is intercepted by and deposited, upon the bot--.

40 tom of the shoe.

One feature of the invention comprises the provision of an improved dust hood for a bufling machine so constructed" and so located with respect to the buffing roll that 46 the impulse imparted to the bulk of the dust by the rotating roll will be utilized in creating a draft for carrying olf the dust. In the illustrative machine the inlet section of the hood is, so to speak, built around the stream composed of the bulk ofthe dust; and, in order to maintain this self-created draft or to conserve the forceof the draft of a blower system to which the hood] may be attached, the remaining section of the By experiment I have found. that when hood is made withnits cross-sectional area uniform throughout and substantially equal H to the opening. of the'inlet. section. Preferably also, the remainingpsection ofthe hood is provided with a 'generaldownward inclination "whereby. the falling particles will aid inmaintainingthe draft.

These and other features ,of'wthe invention, including certain details of construe.

tion and combinations'of. parts will be de-.-

scribed in connection :with .an illustrative machine and pointed out in the appended claim.

Referring ing,-- I

Fig. -1 is a perspectiveof a "portion of a buffing machine-in which'thepresent invention is embodied;

to the accompanying drawofFig.l,and

Fig. 3 is a cross-section of arotating Fig. 2 is a cross-section 'on the line 2 2 bufing roll-witha shoe applied to it showing the approximate paths which the dust.

tends to follow. y a

roll is rotated in the mouth of an ordinary hood and a-shoe presented to said roll in the usual relation as shown, a part of the Apparentlythe roll tends both to set-upa Y I if current of; air inthe hood and to carry around with it an atmosphere laden with dust. Near-the point where the work isprea large part of it is thrown ofi in aboutthe path indicated by the arrows 4, the direction-of this path being apparently the result Referring first to 3, when a bufling dust generated is thrown off in an obliquely 'sented to the roll there is so much dust that i belt applied to a pulley5 has mounted uponit buffing rolls 7, two being herein shown. For convenience the hood will be described as having three sections, an elongated inlet extending, fron the rolls to the locality 9, a.

chamber 11 which progressively decreases in width but increases in depth from front to back of the machine, and an outlet l3 which- 1s circular in cross-section and is adapted to be connected to a suctionpipe. Inasmuch as two rolls are provided in the illustrative machine, the inlet of the-hoodhas two'branches separated by a fan-shaped'partition 10, but it will be understoodthat if one long roll were used there wouldbe no branches.

Inlorder to take advantage of the natural condltlons' illustrated approximately in Fig.

3, the lower wall 12 of the inletsection' of the hood extends in a reverse curve from a point below and at the rear of the 'roll'to a point above it in an obliquely upward and backward direction which corresponds approximately to the lower outline of the stream of dust indicated by the arrows 4 in Fig. 3, while the upper wall 15'extends from a point above the roll into close proximity to, or into light contact with, the upper part of the roll. In the illustrativeembodiment of the invention a hinged member 17 having a brush 19 fast to it forms the extreme end of the upper wall, the brush being in light that part indicated by the arrows 6 willibe,

arrestedby the extremity 'of the upper wall' 15, herein shown as the brush 19.

Inorder to remove all this dustby means ofsuction it is desirable that the area; of'ja cross -section of the hood' at every point of its length should be equal approximately to the said ample area of the inlet or mouth of the hood, since under these, conditions a uniform' and satisfactory draft will" be pro duced with no variation in the speed of travel of the arm through'the hood. provided the suction furnished is adequate. Of

course, if' the air trunks in the shop were very large and the fan which produced the suction were suiliciently powerful, neither the cross-sectional areas of the hood nor the shape and disposition of its walls would greatly matter; but in shoe factories, for which the present invention was devised, the suction available is of only a moderate strength suflicient to removethe dust when forms the extremity of'the upper eeaeee saidgstrength is carefully conserved. With hoods constructed according to my invention however, there is no waste of power in producing the draft nor necessity for providing v l air'trunks of excessive size.

In order to maintainthissubstantial uniformity'in the cross-sectional area" of the hood and provide for uniform speed of travel of the draft, the chamber 11 progressively decreases inwidth and increases in depth from front to back of the machine until it merges into the circular outlet 13, the cross-sectional area of which is substantially the same as that of the rest of the hood at every point of its length. The chamber 11 is preferably given a general downward. inclination so that the falling particles will aid in maintaining" the draft. The suction pipe, not shown, is of approxi mately the same size as the outlet 13. It will, of course, be understood that the space enclosed by the fan-shaped partition-10 is deadspace and not included in the effective area of a cross-section of the hood.

Hitherto it has been customary to provide hoods with large, wide-open mouths and to pay no particular attention to the interior dimensions of the hoods or to their relation to the dimensions of the suction pipe, with the result that the suction while perhaps adequate v if properly applied has been largely wasted and consequently ineffectual.

With the present construction the force of the suction, that is the rate of flow of the. air, isapproximatelythe same at QVGIYIpOiIliT in. the hood that it'is in the suction pipe. 7

This, in-connection withthe generalshape of the hood and it's relation'to the rolls ensures'a thorough removal" oi the dust. The

inlet of the hood is, so to speak, built around the stream of dust indicated by the arrows 4; in Fig. 3 so that this part of the dust which is thrown ofi from the rolhis afiorded' a free passage, the force with which it is;

thrown off beingutilized to aid in carrying it away. The extremity of: the wall 15,

herein shown as the brush 19, blocks the" moving zone of dust indicated by the ar rows 6 in Fig. 3-whereupon it is caught'up by the current flowing through the inletof;

the hood and removed.

The invention has beendescribed in connection with a buflingmachine in which .two"

arbitrary conditions usually exist, first the mouth ofthe suction pipe to which the hood is to be connected is located back ofthe machine at a height from the floor approxi mately the same as that of'the roll, and sec? 1 0nd the work ispresented to the lowerv forward portion of the rollv as shown. It is obvious, however, that the direction of the path of the bulk of that portion of the dust which is thrown oh by the rollwill depend; upon the point on the roll at which the work" is' presented; For example, if the work.

were presented at the front of the roll on a horizontal line through the axis thereof, the path of the bulk of the dust thrownofi by the roll would be obliquely downward instead of upward as in the illustrative machine. It is also obvious that the chamber 11 may extend in a direction other than the one shown if such other direction is more convenient or desirable.

With regard to the path of the bulk of that portion of the dust which is thrown off the roll, and referring to the broken lines A-A and B-B which indicate planes drawn tangent to the roll at the point of contact and at a point diametrically opposite to said point of contact, it will be noted that a wall of the inlet extends from a point adjacent to the plane A-A to a point in the plane BB, and that this relation of the inlet to the point of application should hold true at whatever position the work is presented. It should also be noted that the inlet extends in a direction approximately perpendicular to the plane A-A and that the wall of the inlet for a portion of its extent is concentric with the roll 7.

Although the invention has been set forth in connection with a particular machine, it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described.

Having thus described my invention, I claim as new and desire to secure by Letters Patent of the United States:

A machine of the class described having, in combination, a frame, a rotary bufiing roll mounted on said frame with its under side unobstructed to allow presentation of the work thereto, a hood through which air is drawn to remove the dust generated by the action of the roll on the work, said hood having an inlet section comprising an inclined upper wall terminating in close prox imity to the upper part of the periphery of the roll to intercept the dust carried around by the roll, side walls having curved edges in close proximity to the ends of the roll and a lower wall terminating below and at the rear of vthe roll and extending obliquely upwardly and b-ackwardly in a reverse curve, and a substantially horizontal chamber decreasing in width and increasing in depth from front to rear and forming a rearward continuation for said upper, side and lower walls, the cross-sectional area of said chamber being constant throughout its extent and substantially equal to the crosssectional area of the opening between the roll and the adjacent curved wall of the hood to conserve the draft.

In testimony whereof I have signed my name to this specification.

RICHARD C. COLLINS. 

